#include <stdio.h>    

void ReadNumStudents(int* pt_NumStudents);   
void ReadNumOfGrades(int * pt_NumOfGrades);   
void GetMaxTotalPoints(int NumOfGrades, int* pt_MaxTotalPoints);
void ReadAddGrades(int NumOfGrades, int* pt_TotalPoints); 
int ReadGrade(int);   
void ClassGrades(int NumStudents, int NumOfGrades,int MaxTotalPoints);

int main()
{ 
   int NumStudents;     /* number of students in class       */   
   int NumOfGrades;     /* number of grades for each student */   
   int MaxTotalPoints;  /* total number of possible points   */   
		   
   printf("This program finds the average for each student.\n\n");   
   ReadNumStudents(&NumStudents);   
   ReadNumOfGrades(&NumOfGrades);   
   GetMaxTotalPoints(NumOfGrades, &MaxTotalPoints);   
   ClassGrades(NumStudents, NumOfGrades, MaxTotalPoints);   
   return 0;
}

/*   
 * Function to read and return the number of students   
 * Pre:  none   
 * Post: The (positive) number of students was returned.   
 */   
   
void ReadNumStudents(int *pt_NumStudents)   
{   
   		/* number of students in class */   
		   
   printf("How many students are in the class? ");   
   scanf("%d", &pt_NumStudents);   
   while (pt_NumStudents <= 0)   
   {   
      printf("The number of students must be positive.\n");   
      printf("How many students are there? ");   
      scanf("%d", &pt_NumStudents);
         
   }   
      
}   
   
/*   
 * Function to read and return the number of grades   
 * Pre:  none   
 * Post: The (positive) number of grades was returned.   
 */   
   
void ReadNumOfGrades(int *pt_NumOfGrades)   
{   
		/* number of grades for each student */   
		   
   printf("How many course grades each student has? ");   
   scanf("%d", &pt_NumOfGrades);   
   while (pt_NumOfGrades <= 0)   
   {   
      printf("The number of course grades must be positive.\n");   
      printf("How many course grades each student has? ");   
      scanf("%d", &pt_NumOfGrades);   
   }
   
      
}   
/*   
 * Function to return the maximum total number of points   
 * possible for a student to earn.   
 * Pre:  NumOfGrades is the (positive) number of grades.   
 * Post: The (positive) maximum possible points was returned.   
 */   

void GetMaxTotalPoints(int NumOfGrades, int *pt_MaxTotalPoints)	   
{   
  				/* total number of possible points */   
	int pt_TotalPoints;   
   printf("\nEnter the maximum grade for each course.\n");   
  pt_MaxTotalPoints = ReadAddGrades(NumOfGrades, &pt_TotalPoints);   
   while (*pt_MaxTotalPoints <= 0)   
   {   
      printf("The total maximum grade must be positive.\n");   
      printf("Please enter maximum grade for each course again.\n\n");   
      pt_MaxTotalPoints = ReadAddGrades(NumOfGrades);   
   }   
  
}   
   
/*   
 * Function to compute and print the average of each student   
 * Pre:  NumStudents is the (positive) number of students.   
 *       NumOfGrades is the (positive) number of grades.   
 *       MaxTotalPoints is the (positive) total worth of grades.   
 * Post: Each student's average was displayed.   
 */   
   
void ClassGrades(int NumStudents, int NumOfGrades, int MaxTotalPoints)   
{   
   int student;		/* index - which student */   
   int TotalPoints;	/* total number of points */   
   float average;	/* student's average */   
		   
   for (student = 1; student <= NumStudents; student++)   
   {	   
      printf("\nEnter the grades for student %d.\n", student);      
      TotalPoints = ReadAddGrades(NumOfGrades);   

      average = (float)100 * TotalPoints / MaxTotalPoints;   
		   
      printf("\nAverage for student %d = %.1f%%\n",student, average);   
   }   
}   
   
/*   
 * Function to read and total grade and to return total   
 * Pre:  NumOfGrades is the (positive) number of grades.   
 * Post: The nonnegative total grade points was returned.   
 */   

void ReadAddGrades(int NumOfGrades, int *pt_TotalPoints)   
{   
   				
   int grade;			/* index - which grade    */   
	   
   pt_TotalPoints = 0;		   
   
   for (grade = 1; grade <= NumOfGrades; grade++)   
	pt_TotalPoints += ReadGrade(grade);   
   
  
}   
   
/*   
 * Function to read and return an integer grade    
 * Pre:  grade is the number of the grade.   
 * Post: A nonnegative grade was returned.   
 */   
   
int ReadGrade(int grade)   
{   
   int points;			/* points for one test*/   
	   
   do   
   {   
      printf("Enter the nonnegative value of grade %d: ", grade);   
      scanf("%d", &points);   
   }while (points < 0);   
   
   return points;   
}